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Cisco Bug: CSCus95375 - Bootloop When Adding A 3750X 12.2(53)SE To An Existing Stack Of 15.0(2)

Last Modified

Aug 17, 2015

Products (175)

  • Cisco Catalyst 3750-X Series Switches
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco Catalyst 2960-24TC-L Switch
  • Cisco Catalyst 2960C-8TC-S Switch
  • Cisco Catalyst 2960S-F48FPS-L Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
  • Cisco Catalyst 3560X-48P-S Switch
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Known Affected Releases


Description (partial)

When adding a third switch running 12.2(53)SE2 to a stack running 15.0(2)SE6 will cause the new switch to elect as switch 2 and go into a bootloop. New switch never joins stack. Issue is not seen with 12.2(55)SE or above.

Stack running 15.0(2)SE [Switch1, Switch2]
Replacement or new switch running 12.2(53)SE2 configured as default priority and switch 1 [Physically Switch 3]

When 3rd switch is added to the stack the expectation is that it renumbers to Switch 3 and joins the stack then auto-upgrades to required image.

This doesn't occur and switch 3 elects as switch 2 and never joins the stack. It goes into a boot loop, and or, stays up as master independently.
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